A blank sailing (also called a void sailing) is a scheduled voyage that the carrier or alliance cancels, either for the whole loop or for one or more port calls on it. It is a carrier decision made weeks ahead, usually to fit capacity to demand, and it is not the same thing as your container being rolled to a later ship. If your booking is on a blanked voyage, the usual outcome is a move to the next available sailing, with a new cargo cut-off and a new arrival date. Nothing in a standard bill of lading promises a sailing date, so the practical defence is planning, not claims. For the rolled-container side of the problem, see our guide to rolled cargo prevention.
Blank sailing, skipped port, rolled container and delay: what each term means
These five terms get used interchangeably in quotes and emails. They are different events, and the difference decides who tells you, how much notice you get and what you can do about it.
| Term | What happens | Who decides | When you usually learn of it |
|---|---|---|---|
| Blank (void) sailing | A scheduled voyage on a service does not operate at all | Carrier or the carriers sharing the service | Typically weeks before departure, by advisory |
| Skipped or omitted port call | The ship sails but bypasses one or more ports on its rotation | Carrier, often reacting to congestion or schedule slippage | Days to weeks before the call, sometimes less |
| Rolled container | The voyage operates, but your container is not loaded and moves to a later ship | Carrier or terminal, because of space, weight, documentation or gate-in problems | Often at or after cut-off |
| Delayed sailing | The voyage operates, but departs or arrives later than scheduled | Weather, port waiting time, upstream delays | Through updated ETAs |
| Port or vessel substitution | Your cargo travels on another vessel or via another port | Carrier, under the liberties in its terms | Varies |
A point of vocabulary worth knowing: the US Federal Maritime Commission uses a wider definition than most trade press. In 46 CFR 542.1(b), as published in the eCFR, a blank sailing means a sailing skipping one or more specific ports while still traversing the rest of the route, or the entire sailing being cancelled. So a regulator may call a skipped port a blank sailing, while a booking agent will use "blank" only for a full cancellation. When you read an advisory, check which one it is describing, because a skipped port at the other end of the rotation may not affect you at all.
Why carriers blank sailings
Carriers rarely give a reason beyond a line in an advisory, but the reasons fall into a few recurring groups.
- Capacity management. When bookings on a loop fall short of what the ships can carry, a carrier can cancel one departure and push its cargo onto the others. Drewry, which tracks this weekly, describes blank sailings as a way for carriers to adjust supply to demand. Supply cuts also tend to support rates, which is why shippers sometimes treat blanking as a pricing tactic. That is an inference from the market effect, not something carriers state.
- Weak demand around holidays. Export volumes from China and the rest of Asia drop around Lunar New Year, and carriers have long cut departures to match. Our Chinese New Year 2027 shipping calendar covers how to plan the cargo-ready dates around it. The opposite problem, a rush of bookings in peak season, is what produces rolled cargo instead; see what happened in the 2026 peak season.
- Port congestion and disruption. A string running days behind can skip a port, or blank a later voyage, to get back on schedule. Sea-Intelligence attributed the sharp fall in global schedule reliability in August 2026 to severe port congestion in Asia. Longer routings such as the Cape diversions described in our Red Sea and Cape routing analysis stretch rotations and make this kind of recovery blanking more likely.
- Equipment imbalance. Carriers also cite empty-container positioning, where too many boxes sit in one region and too few in another. Treat this as a commonly stated carrier rationale rather than a measured cause, since no public source we found splits blank sailings by reason.
- Network or alliance changes. Several carriers share ships on most East-West services under vessel sharing agreements, so a decision on one voyage is often taken jointly. Our guide to vessel sharing agreements and slot chartering explains the mechanics, and the 2026 alliance overview lists who sails with whom.
How often blank sailings happen, and what the data can and cannot tell you
There is no single global count of blank sailings. The figures that exist cover specific trades or measure something different, and the numbers move every week.
- Drewry's Cancelled Sailings Tracker covers the main East-West trades and compares blank sailings announced by each alliance with scheduled sailings. Its update dated 2 October 2026 showed 39 blank sailings expected from week 41 (5 to 11 October) to week 45 (2 to 8 November), out of 710 planned sailings. That is a 5% cancellation rate, with 95% of scheduled sailings still expected to operate. It is a forward look at announced cancellations, so later additions will change it.
- Sea-Intelligence's Global Liner Performance report measures schedule reliability, not blankings. For August 2026 (published 29 September 2026) it reported global schedule reliability of 49.9%, down 5.9 percentage points on the month and the lowest since September 2022, with the average delay for late vessels at 6.81 days. We could not confirm from the sources we reviewed how the metric treats a voyage that never sailed, so do not read a reliability figure as a count of cancellations.
- Methodology differences matter. TradLinx reported that Xeneta's August 2026 scorecard, published on 17 September 2026, put global on-time arrivals at 29%, against Sea-Intelligence's 49.9% for the same month. The two use different methods, so compare within one provider across months rather than between providers.
A 5% cancellation rate sounds small. For a shipper it is not: on a weekly service it is roughly one departure in twenty, and the cancelled one is not randomly chosen. Cancellations cluster on the trades and weeks where demand is weakest, and the cargo from a blanked voyage lands on the voyages around it, which are then fuller.
How shippers and forwarders find out about blank sailings
- Carrier advisories. Large carriers publish customer advisories for network changes. As one example, Maersk's advisory of 10 August 2026 announced that a northbound voyage on its Adriatic and South East Med service was cancelled to balance capacity with demand and protect schedule reliability. It said confirmed bookings would be protected on the next available sailing, subject to operational constraints, with revised cargo receiving dates and documentation cut-offs to follow. Other carriers word these differently.
- Your forwarder or booking agent. Forwarders see advisories across many carriers and often learn first. Ask yours to flag blanked voyages on your lane, not just your own bookings.
- Booking and tracking systems. A changed vessel name, voyage or cut-off date on a booking confirmation is often the first sign. Our guide to container tracking covers what the status fields mean.
- Weekly and monthly trackers. Drewry's tracker shows which trades face cancellations in the next five weeks. Sea-Intelligence publishes reliability by month and trade lane. Use these for planning, not for a specific booking.
What happens to a booking when its sailing is blanked
The outcome depends on the carrier, the service and what you booked. The common pattern is one of three:
- Protected on the next sailing. The carrier moves confirmed bookings to the next voyage on the same service. This is the usual result, but the new cargo cut-off, gate-in window and arrival date all shift, and the next voyage may itself be fuller.
- Moved to another service or port. The carrier offers a different string, a different port of loading or discharge, or a transhipment routing. Check the inland haulage, customs and delivery consequences before accepting.
- Booking cancelled. If there is no workable alternative, the booking is cancelled and you rebook. Whether the new booking keeps your contract rate or reverts to the market rate is a question for your contract and your carrier, so ask before you assume.
What the contract says
Carriers' standard terms are generous to the carrier on timing. Maersk's published terms for carriage, as we read them in October 2026, give the carrier broad liberties to change routes, substitute vessels and call at ports in any order, state that there is no undertaking that goods will arrive at any particular time, and exclude liability for loss caused by delay or cap it at the freight paid. Clause numbers and wording differ between carriers and versions, so read the version that applies to your bill of lading. The practical reading is that a blank sailing, on its own, rarely gives a shipper a claim for consequential loss such as a missed sales window. Whether you have any claim depends on your contract and the governing law, which is a question for a maritime lawyer.
Some carriers sell something stronger. Maersk's help pages describe a loading guarantee on some products, with compensation if cargo is not loaded on the booked vessel or departure slips by more than three days, and no compensation if the customer waived the guarantee. That is one carrier's product, not an industry rule, and its terms change.
What US regulation does and does not cover
The US Federal Maritime Commission's rule on unreasonable refusals of cargo space (46 CFR Part 542, which implements part of the Ocean Shipping Reform Act of 2022) took effect on 23 September 2024. Among its examples of potentially unreasonable conduct is a blank sailing or schedule change with no advance notice or with insufficient advance notice. The Commission weighs conduct case by case, and as published the rule sets no minimum notice period and no rebooking or compensation scheme for blank sailings. The documented export policy requirement in the same part had a separate effective date, so check the current text. Treat the rule as a standard a carrier can be held to in US trades if its conduct is unreasonable, not as a right to be rebooked.
Effects on cargo-ready dates, free time and delivery promises
- Cargo-ready and gate-in dates. A blanked voyage resets the cut-off. If your supplier has already trucked cargo to the terminal, ask the carrier what happens to the gate-in and whether storage applies. Our supplier cargo readiness checklist helps keep production and booking dates aligned.
- Free time. Detention and demurrage clocks run from specific events such as discharge, availability and empty return, not from the original ETA, so a later vessel shifts them. A container that arrives in a congested port can still run into storage. The FMC demurrage and detention billing rules explain what an invoice must show.
- Delivery promises to buyers. A sales contract delivery date does not move because a sailing did. Where you promised a date, the delay risk sits with you unless the contract says otherwise.
- Letters of credit. A credit usually has a latest shipment date and an expiry date. If a blanked voyage pushes the on-board date past the credit's latest shipment date, you need an amendment from the buyer before shipping, not after.
Practical ways to reduce the damage
- Build a buffer into your booking window. Aim for cargo ready well ahead of the cut-off for the sailing you want, and know the sailing after it. In the weeks around Lunar New Year and in peak season, allow more.
- Ask for the blank sailing list. Before committing a date, ask your forwarder which voyages on your lane have been blanked or are expected to be, and check Drewry's tracker.
- Split shipments across two sailings where the cargo and the buyer allow it, so one cancellation does not hold everything.
- Use more than one carrier or port pair. A second carrier, or a nearby port, gives you somewhere to move. Weigh the added inland haulage and customs work.
- Understand your allocation. Under a service contract, the committed volume and what the carrier owes when it cancels a voyage are contract terms. Our piece on freight forwarder rate negotiation with carriers covers how forwarders approach allocations.
- Get the rebooking terms in writing. Ask what happens to rate, cut-off, free time and any storage, and keep the carrier's notice.
What to do next
- Check your booking confirmation and the carrier's advisories for the voyage you are on, and confirm the vessel, voyage and cut-off still stand.
- If the sailing is blanked, ask for the replacement vessel, the new cut-off and the new ETA in writing, and re-check any letter of credit dates and buyer commitments.
- Ask your forwarder to quote the next two sailings and one alternative carrier or port, so you have a fallback before you need one.
- For your next shipment, book earlier than the minimum, check Drewry's tracker for your trade and plan around known holiday and peak periods.
More than 29,300 logistics companies are searchable by country and service in the CargoLinked directory, which is a place to find forwarders on your lane who can quote alternative carriers. The public requests board lists freight that shippers have posted for forwarders to quote on directly.
This article is general information about ocean shipping practice and is not legal, financial or customs advice. Carrier terms, regulations and published statistics change, and the figures above are as of the dates stated (checked 6 October 2026). Confirm the terms that apply to your booking with your carrier or forwarder, and take legal advice before relying on any claim.
